Bag stringing machine



Aug. 1, 1933. E. E. WEST ET AL BAG STRINGING MACHINE Filed July 25, 1950 4 Sheets-Sheet l Aug. 1, 1933. E. E. WEST ET AL BAG STRINGING MACHINE Filed July 25, 1930 4 Sheets-Sheet 2 Aug, 1, 1933. E. E. WEST ET AL BAG STRINGING MACHINE Filed July 25, 1930 4 Sheets-Sheet 3 Aug. 1, 1933. E. E. was-r ET AL L BAG STRINGING MACHINE Filed July 25, 1930 4 Sheets-Sheet 4 mwmmm'. Msfi Patented Aug. 1, 1933' TEs Clymer, Reidsville, N. 0., assignors, by direct and mesne assignments, to said Edward E.

West

- Application July 25, 1930. Serial No. 470,616.

I .20 Glaims.

This invention has to do with bag stringing machines, the object thereof being to provide mechanism which will automatically carry a string under the hem. of a continuous web of bag forming material during the folding of the hemthereof and perforate such fold to carry loops of string into positionto be drawn out so as to be subsequently severed, whereby when each blank is severed from the web of material to form a bag blank the string will have projecting ends which may be used to gather the top of the bag, thus obviating the necessity of stringing the bag subsequently and thereby very much facilitating the expeditious manufacture v of such bags and decreasing the expense of such manufacture. i 1 As is well known, a continuous web is passed through a sewing machine and during its passage one edge of the material passes through a folder to form a hem, this hem being stitched by the sewing machine. The web is subsequently cut into bag blanks,

each of a .sizeto form the desired'size of bag; and then the string is passed through the folded hem portion for the purpose of gathering the neck of the bag, a common form of such bag being l m n bag.

This method of v stringing-the bags, however, is slow and expensive and theobject therefore, of the present invention is to automatically string the bag material simultaneously with the 'hemming thereof and then draw out loops of stringat intervals so that when these loops are severed into bag blanks sufficient stringhwill project from the, cut ends of the blank toven'able the mouth of the bag to be gathered and closed when the blank is stitched intoa bag, and to do this by a simple and eiiicie'nt and inexpen sive 'mechanism applicable to the ordinary hem folding and stitching mechanism heretofore used for the formation of the hem;- of bag material. In the drawings: accompanying'and forming a part of this specification v.

Fig. lis afrontview 'of a bag-hennning and stitching machine having this improved stringing mechanism applied thereto.

Fig. 2. is a top view'oi the machine with a part of the sewing" machine brok n'away.

Iig. 3 is a left hand endview of Fig. 1

Fig. 4 is a detail viewpartly in iectionilluss trating the means for drawing out the loops of string Fig. 5 is a plan view of the'loop drawing out means and loop conveying'means for carrying the loopsinto position to be severed; Similar characters of reference indicate corresponding parts in thesevera'l views. 7

'Before explainingin detail the present improvem'entt and mode of operation thereof, I

bag material in the form of required .size of bag blanks szszs is not limited to the details of construction and arrangement of parts which are illustrated in the accompanying drawings, sincethe invention is capable of other embodiments, and that'the phraseology which I employ is for the purpose of description'and not of limitation.

As the machine for stitching the web hem of bag material is ofwell known form, it is not deemed necessary todescribe in'detail the conthe support for the passage or" the web of matewheel 11 mounted on a shaft 12 having at its opposite. end a gear 13 in mesh withan adjustablysupported gear 14 carried by a bracket 15 i which in turn meshes with a gear 16 mounted on the end of a cam shaft 17 for driving the cam shaft; The vgear 13 meshes with a gear 18 which drives a gear ls carried by the lower feed roll 20 thereby to rotate it, the uppenfeed'r'oll' 21 being adjustably. held in frictional contact with the roll 20.

a or the purpose oi severing the webvof mate- 7 rial into bag blanks we have provided the machine at the rear of these'feed rolls with a bag severing means comprising a fixed .knife 22 and a rotary-knife 23 timed to sever the web intolthe The shaft of the rotary kniferoll is provided with a gear 24 in mesh with a gear 25 which is driven by the gear 18. By this gear systemthe cam shaft 17, the

feed rolls and "knife rolls arerotated from the motor through the Y main driving shaft'fl2. Mounted on the cloth plate 4 above the sewing machine cylinder carrying the usual .looper mechanism is located a hem folder 26 vadjustably supported onthis cloth plate This folder is of a form to fold the hemof the; continuously fed web of material which is lead from a supply roll 2'7 placed in front of the machineto and through the sewing machine to the feed rolls 7 and to the cutting rolls where it is cut into bag blanks.

Mounted on a on the tableof the machine is a string ng neepair-of guide rods zasupportea dle or perforator 28', thisstringing needle being secured to a sliding block 28" mounted on the guide rods and this needle carries the string to be fed into the hem of the travelling web of material. dle a lever 29 is pivotally connected with. the

slide block and with an upright lever 30 pivotal-'- ly mounted on the frame of the machine as'at 31 and having its lower end 32 provided with a roll in position to be engaged by a cam member 33 carried on the cam shaft 17, a spring 34 holding this lever 30 in engagement with the cam member. Thus, as the cam shaft is rotated the stringing needle or perforatoriis reciprocated toward and from the folded. hem thereby to carry the. eyethereof into the hem and through the folded edge of the hem in the manner shown in Fig. 5, the'string of course i being drawn from a suitable supply roll.

As the stringing needle perforatesthe fold of the hem which takesplace before the hem is stitched by the stitching mechanism the loop of the string is carried into position to be engaged y theloop drawing out means 35 in the form of an oscillating hook located on the upper end of a shaft 36, the lower end of which is "provided with a bevel gear 37 (see'Fig. 4) in mesh with a similar gear 38 mounted on the end "of a horizontal shaft '39 the opposite end of which is connected with a link 40 pivotally connectedto a lever 41 pivoted as at'42 to the frame of the machine and the lower end of which is provided with a cam roll 43 held in engagement by a spring 44 with a cam member 45 mounted on the cam shaft 17 and by which mechanism.

engaged by the loop, drawing out means in the manner shown in Fig. 5, so that the string is thus laid 'in spaced intervals under the hem and held therein by the stitch line when this'hem is stitched, this mechanism thus forming a very simple means for carrying a string into the hem and through the folded edge thereof to' permit the loops of the string to be caught and carried into position to be conveyed into position to be severed, the member 35 thus drawing out a suffi cient loop of string to enable it to be grasped and draw the open-mouthed end of the bag together when the baglblanks have been severed from the web of material along the lines a-a, Fig.5, each portion between a pair of these lines forming, a bag blank which when doubled upon itself with the, opposite edges thereof seamed,

will form a bag.

It will also be observed that the stringing needle together with the loopdrawing out means actsto draw the loop into and-against the fold of the hem in the manner shown at b in Fig. 5 so that it is away from the stitch line when the hem is stitched by" the sewing mechanism.

When the-loops carried by the conveyinghooks 46 of the conveyor 47 reach the web cutting off knives these loops may also be severed by these 'kniveswhich, in such case, would be sufficiently elongated to accomplish this purpose, these For reciprocating this stringing nee-- of material to form bag blanks.

knives severing the web of material along the lines a--a. as hereinbefore stated, although of course the loops could be severed by hand if preferred. The loop conveyor may consist of a belt or chain carrying the hooks 46 located at intervals so that when the loops are drawn out by the member 35 they will be in position to be caught by the conveyor hooks 46 and carried along by the conveyor and thus prevent them from falling and interfering with the mechanismof the machine. This conveyor may be operated-by any suitable means as sprocket gears or otherwise (see Fig. 4) and driven by a suitable connection with the main driving shaft.

From the foregoing it willbe seen that each bag blank when severed from the web has a materially greater length of string than hem.

It isto be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the inand through the hem fold to form'loops, means for engaging the loops and drawing out the string, and means for stitching the hem with the tion of means for folding a hem in a continuous ly fed web of material, a string carrying perforator' for conveying the string underthe hem and through the hem fold to form loops, means for engaging .the loops and drawing out the string, means for stitching the hem with the string therein, and means for conveying the loops of string into position to be severed.

. 3. In a bag stringing machine, the combination of means for folding a hem in a continu ously fed web of material, a string carrying perfcratoi'for conveying the string under the hem and through the hem fold to form loops, means for engaging the loops and drawing out the string, means for stitching the hem with the string therein, means for conveying the loops of string into position to be severed, and means for severing the loops. 4. In a bag string machine, the combination of 'means for folding a hem in a continuously fed web of material, a string carrying perforator for conveying the string under the hem and through the hem fold toform loops, means for engaging theloops and drawing out the string, means for stitching the hem with the string therein, means for'conveying the loops of string into position to be severed, and means for severing the loops simultaneously with the severing of the web 5. In a bag stringing machine, the combination of means for folding a hem in'a continuously fed web of material, means operative transversely of the direction of feed of the materialforthen carrying a string under. the hem after the formation of such hem and through the fold thereof to form loops, means for drawing out the loops of string, means for stitching the hem with'the string therein, and means for severed.

7 to position to be severed.

i 12. In a bag stringing machine, the combina-w 6. In a bag stringing machine, the combination of means for folding a hem in a continuously [fed web of material, means operative transversely of the direction of feed of the material for then carrying a string under the hem after the formation of such hem-andrthrough' the fold thereof to form loops, means fcrdrawing out the loops of string, means for stitching the hem with the string therein, and means for severing the web of material into bag blanks;

in a bag stringing machine, the combination of means for folding a hem in a continuously fed web of material, means operative transversely of the direction of feedof the material for then carrying a string under the hem after the formation of such hem and through the fold thereof to form loops, means for drawing out the loops of string, means for stitching the hem with the string therein, means for conveying the loops of string into positionv to be severed, and means for simultaneously severing the web of material into bag blanks.

'8. In a bag stringing machine, the combination of means for folding a hem in a'continuously fed web of material, means for then carrying a string under the hem after the formation of such hem and through the hem, means for stitching the hem with the string therein, and means for severing the web of material into bag blanks.

9. In a bag stringing machine, the combination of means for folding a hem in a continuously fed web of material, a string carrying. perfcrator, means for reciprocating it thereby to'carry the string under the hem and through the fold thereof to form loops, and means for stitching the hem with the string therein.

l0.-In a bag stringing machine, the combination of means for folding a hem in a continuously fed web of material, a string carrying perforater, means for reciprocating it thereby to carry the string under the hem and through the fold thereof to form loops, means fohstitching the'hem with the string therein, and an oscillating loop draw out means and. meansfor oscillating it. 7

11. In a bag stringing machine, the combination of means for folding a hem in a continuously fed web'of material, a string carrying perforator, means for reciprocating it thereby to: carry the string under the hem and through the fold thereof to form loops, means for stitching the hem with the string therein, an oscillating loop draw out means and means for oscillating it, and means for conveying'the loops intion of means for folding ahem'in a continuously fed web of materiaL. a string carrying perforator, means for reciprocating it thereby to carry the string under the hem and through the fold thereof to form loops, means for stitching the hem with the string therein, an oscillating loop draw out means and means for oscillating it, means for. conveying the loops J into position to be" severed, and means for simultaneously severing the web of material into. bag blanks and the loops of string.

13. In a bag stringing machine, the combination of means for folding a hem in a continuously fed web of material, .means operative transversely to the direction of feed of the material for carrying a string under the hem and through the fold thereof during the feeding of the materialto form string loops, means operative transversely of the stringing means to engage and draw out said loops of string, and.

means for severing the web of material into bag blanks whereby when the loops are also severed,

each bag blank will have a materially greater length of string than the length of the hem.

14. In abag stringing machine, the combina; tion of means for continuouslyfeeding a web of material, means for folding a hem in such continuously fed web of material, means for carrying a string under the previously formed hem and through the material, and meansfor stitching the hem with the string loose therein.

15. Ina bag stringing machine, the combinationof meansfor continuously feeding a web of material, means for folding a hem in such continuously fed web of material, means for carrying a string under the previously formed hem and through the web to form loops, means for drawing out the loops of string, and means for stitching the hem with the string loose therein.

16. In a bag stringing machine, the combination of means for continuously feeding a web of drawing out loops of string means for conveying the loops of string into position to be severed, and means for stitching the hem with the string loose therein. 1

17. In a bag stringing machine, the combination of means for continuously feeding a web of material, means for folding a hem in such continuously fed web of material, an eye-formed string retaining needle operative after the folding means for conveying a string under the previously formed hem and through the material thereof, and means for stitching the hem with the string loose therein.

18. In a bag stringing machine, the combination of meansfor continuously feeding a web of material, means for folding a" hem in such continuously fed web of material, means for carrying a string under the previously formed hem thereof and through the material to form loops,

means for stitching the. hem with the string loose therein, and loop engaging means.

19. In a bag stringing machine, the combina tion of means for continuously feeding a web of material, means for folding a hem in such continuously fed web of material, means for simul taneously perforating and carrying a string under the previously formed hem and through the fold thereof to form loops, and means for stitching the hem with the string loose'therein,

'20. In a bag stringing machine, the combination of means for continuously feeding a Web of material, means for folding a hem in such continuously fedweb of material, means for simultaneously perforating and carrying a string 1 i EDWARD E. WEST. DEWEY CLYMER. 

